Mole is the base unit of ‘amount of substance’ which is one of the fundamental quantities, as defined by the International System of Units.

One mole is defined as the total amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilograms of carbon-12. This has been defined by the International Bureau of Weights and Measures as of 2011. When the mole is used for measurement, the elementary entities must be specified or specified groups of particles. One mole of any substance is now defined as containing 6.022 140 76 x 10^23 particles. The term ‘mole’ has been coined by chemist Wilhelm Ostwald in 1894 from the German word Molekül (molecule). The mole was made the seventh SI base unit in 1971 by the 14th CGPM.

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